SB2021041381 - SUSE update for MozillaThunderbird
Published: April 13, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 7 secuirty vulnerabilities.
1) Out-of-bounds read (CVE-ID: CVE-2021-23981)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition during texture upload of a Pixel Buffer Object in WebGL. A remote attacker can create a specially crafted web page, trick the victim into opening it, trigger out-of-bounds read error and read contents of memory on the system.
2) Information disclosure (CVE-ID: CVE-2021-23982)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to the way Firefox handles requests to internal hosts. Using techniques that built on the slipstream research, a malicious webpage could have scanned both an internal network's hosts as well as services running on the user's local machine utilizing WebRTC connections.
3) Spoofing attack (CVE-ID: CVE-2021-23984)
The vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to incorrect processing of user-supplied data. A malicious extension could have opened a popup window lacking an address bar. The title of the popup lacking an address bar should not be fully controllable, but in this situation was. This could have been used to spoof a website and attempt to trick the user into providing credentials.
4) Buffer overflow (CVE-ID: CVE-2021-23987)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing HTML content. A remote attacker can create a specially crafted website, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
5) Cryptographic issues (CVE-ID: CVE-2021-23991)
The vulnerability allows a remote attacker to email encryption.
The vulnerability exists in the way Thunderbird uses the OpenPGP key refresh mechanism while handling the extended validity key period. A remote attacker can send victim an email containing a crafted version of the original key and an invalid subkey and force the application to use the invalid subkey, which will result in failure to encrypt the original email message when sending it.
6) Spoofing attack (CVE-ID: CVE-2021-23992)
The vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to incorrect processing of user-supplied data, when checking if the user ID associated with an OpenPGP key has a valid self signature. An attacker may create a crafted version of an OpenPGP key, by either replacing the original user ID, or by adding another user ID. If Thunderbird imports and accepts the crafted key, the Thunderbird user may falsely conclude that the false user ID belongs to the correspondent.
7) Input validation error (CVE-ID: CVE-2021-23993)
The vulnerability allows a remote attacker to disable sending of encrypted messages.
The vulnerability exists due to insufficient validation of imported OpenPGP keys. A remote attacker can force the victim to import a specially crafted OpenPGO key with a subkey that has an invalid self signature and prevent users from sending encrypted messages to a correspondent.
Remediation
Install update from vendor's website.